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Why the onAnimationEnd does not trigger when switching the focus to other tab of the browser?

I am trying to build a split-flap.
Here is my code:
let baseDiv, lowerDiv, middleDiv, upperDiv;
let intervalId;
document.addEventListener("DOMContentLoaded", () => {
baseDiv = document.getElementById("base");
lowerDiv = document.getElementById("lower");
middleDiv = document.getElementById("middle");
upperDiv = document.getElementById("upper");
});
let backward = () => {
middleDiv.innerHTML = baseDiv.innerHTML;
lowerDiv.classList.add("rotate0to90");
middleDiv.className = "upperHalfCard-after transform0to_90 zIndex4";
}
let forward = () => {
middleDiv.innerHTML = baseDiv.innerHTML;
upperDiv.classList.add("rotate0to_90");
middleDiv.className = "lowerHalfCard-after transform0to90 zIndex4";
}
let handler = obj => {
console.log(obj.id);
switch (obj.id) {
case "lower":
lowerDiv.classList.replace("zIndex4", "zIndex2");
middleDiv.classList.add("rotate_90to0");
break;
case "middle":
upperDiv.innerHTML = baseDiv.innerHTML;
lowerDiv.innerHTML = baseDiv.innerHTML;
middleDiv.className = "hide";
upperDiv.className = "upperHalfCard-after zIndex4";
lowerDiv.className = "lowerHalfCard-after zIndex2";
break;
case "upper":
middleDiv.classList.add("rotate90to0");
upperDiv.classList.replace("zIndex4", "zIndex2");
break;
default:
break;
}
}
let start = () => {
intervalId = setInterval(() => {
console.log("Kicked by interval");
forward();
}, 3000);
}
let stop = () => {
clearInterval(intervalId);
}
.fullCard,
.lowerHalfCard,
.upperHalfCard,
.fullCard-after,
.lowerHalfCard-after,
.upperHalfCard-after {
background-color: inherit;
border-radius: 10px;
height: 100%;
width: 100%;
position: absolute;
align-items: inherit;
display: inherit;
justify-content: inherit;
}
.fullCard-after::after,
.upperHalfCard-after::after {
content: "";
display: block;
position: absolute;
height: 4px;
background-color: inherit;
width: 100%;
top: calc(50% - 2px);
}
.lowerHalfCard-after::after {
content: "";
display: block;
position: absolute;
height: 4px;
background-color: inherit;
width: 100%;
top: calc(50% - 2px);
}
.lowerHalfCard,
.lowerHalfCard-after {
clip-path: polygon(0% 50%, 100% 50%, 100% 100%, 0% 100%);
}
.upperHalfCard,
.upperHalfCard-after {
clip-path: polygon(0% 0%, 100% 0%, 100% 50%, 0% 50%);
}
.splitFlap {
background-color: black;
box-sizing: border-box;
border-radius: 10px;
color: white;
font-weight: bold;
font-family: arial;
font-size: 5.5em;
width: 100px;
height: 150px;
position: relative;
align-items: center;
display: flex;
justify-content: center;
transform-style: preserve-3d;
}
.rotate0to90 {
animation-name: r0to90;
}
.rotate90to0 {
animation-name: r90to0;
}
.rotate0to_90 {
animation-name: r0to_90;
}
.rotate_90to0 {
animation-name: r_90to0;
}
.rotate0to90,
.rotate90to0,
.rotate0to_90,
.rotate_90to0 {
animation-duration: 0.3s;
animation-fill-mode: forwards;
}
#keyframes r0to90 {
from {
transform: rotateX(0deg);
}
to {
transform: rotateX(90deg);
}
}
#keyframes r90to0 {
from {
transform: rotateX(90deg);
}
to {
transform: rotateX(0deg);
}
}
#keyframes r0to_90 {
from {
transform: rotateX(0deg);
}
to {
transform: rotateX(-90deg);
}
}
#keyframes r_90to0 {
from {
transform: rotateX(-90deg);
}
to {
transform: rotateX(0deg);
}
}
.transform0to_90 {
transform: rotateX(-90deg);
}
.transform0to90 {
transform: rotateX(90deg);
}
.hide {
display: none
}
.zIndex2 {
z-index: 2;
}
.zIndex4 {
z-index: 4;
}
<div class="splitFlap">
<div id="base" class="fullCard-after zIndex2">
2
</div>
<div class="upperHalfCard-after zIndex4" id="upper" onAnimationEnd="handler(this)">
1
</div>
<div id="middle" class="hide" onAnimationEnd="handler(this)">
</div>
<div class="lowerHalfCard-after zIndex2" id="lower" onAnimationEnd="handler(this)">
1
</div>
</div>
<p>
<button onClick="start()">
Start
</button>
<button onClick="stop()">
Stop
</button>
</p>
The code works fine where the tab is on focus.
And you can see the onAnimationEnd event handler and interval handler work properly(i.e. 1 interval event trigger 2 onAnimationEnd event.).
Unfortunately, when switching the browser focus to another tab for about 1 min, the onAnimationEnd event handler seems to be not stable(i.e. sometimes only an interval event is triggered, and no onAnimationEnd event is triggered, sometimes the onAnimationEnd event handler can be resume).
What's going on? how can I fix it?

Fade in pause for a sec and fade out a span only JS CSS HTML

hey i try to fade in pause for a sec and fade out a span , im using class add and remove through timeout and interval . i cant figure it out someone can help?
i tried to do it with active class but i didnt make it .
i searched for it on google and found nothing with JS only Jquery that i dont want to use ATM
--------HTML----
<div class="desgin">
<div class="im__desgin"><h1>I'm Desgin.</h1></div>
<div class="what__design">
<span class="design-kinds ">WebSite's</span>
<span class="design-kinds">Logos</span>
<span class="design-kinds">Brands</span>
</div>
</div>
-----CSS-----
.desgin {
font-size: 40px;
/* color: aliceblue; */
color: #000;
align-items: center;
justify-content: space-between;
padding: 40px 150px;
position: relative;
float: left;
}
.what__design {
font-size: 8rem;
align-items: center;
float: left;
opacity: 1;
position: relative;
}
.design-kinds {
opacity: 0;
visibility: hidden;
position: absolute;
}
/* .design-kinds.active {
opacity: 1;
visibility: visible;
animation: fade 3s ease-in-out 3s 1;
} */
.design-kinds.fadein {
animation: fadeIn 1s ease-in;
visibility: visible;
}
.design-kinds.fadeout {
animation: fadeOut 1s ease-out;
visibility: hidden;
}
#keyframes fadeIn {
0% {
opacity: 0;
}
100% {
opacity: 100;
}
}
#keyframes fadeOut {
0% {
opacity: 100;
}
100% {
opacity: 0;
}
}
---JS---
const changeText = document.querySelector(".what__design");
const textToShow = document.querySelectorAll(".design-kinds");
//Fade in First span and fade out Last span
let index = 0;
let doneOrNot = "not";
function showText() {
const spans = [...textToShow];
if (index === spans.length - 1) {
index = 0;
}
if (doneOrNot === "done") {
doneOrNot = "not";
setTimeout(() => {
spans[index].classList.remove("fadein");
spans[index].classList.add("fadeout");
}, 4000);
index++;
console.log(doneOrNot);
}
if (doneOrNot === "not") {
spans[index].classList.add("fadein");
doneOrNot = "done";
console.log(doneOrNot);
}
}
setInterval(showText, 4000);
THANKS <3

If you want to animate it for a single time, than you don't want to need javascript.
.desgin {
font-size: 40px;
/* color: aliceblue; */
color: #000;
align-items: center;
justify-content: space-between;
padding: 40px 150px;
position: relative;
float: left;
}
.what__design {
font-size: 8rem;
align-items: center;
float: left;
opacity: 1;
position: relative;
}
.design-kinds {
position: absolute;
}
.web{
animation: animate1 4s 2s 1 ease-in-out ;
color: black;
opacity: 0;
}
.logo{
animation: animate1 4s 8s 1 ease-in-out ;
opacity: 0;
}
.brand{
animation: animate1 4s 14s 1 ease-in-out ;
opacity: 0;
}
#keyframes animate1{
0%,100%{
opacity: 0;
}
50%{
opacity: 10;
}
}
#keyframes animate2{
0%,100%{
opacity: 0;
}
50%{
opacity: 10;
}
}
#keyframes animate3{
0%,100%{
opacity: 0;
}
50%{
opacity: 10;
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div class="desgin">
<div class="im__desgin"><h1>I'm Desgin.</h1></div>
<div class="what__design">
<span class="design-kinds web">WebSite's</span>
<span class="design-kinds logo">Logos</span>
<span class="design-kinds brand">Brands</span>
</div>
</div>
<!-- <script src="index.js"></script> -->
</body>
</html>

The given JS checks whether done is set, if it is immediately sets it to not and then checks if it's not and acts on that. This probably needs changing to an if...else combination.
Although you can do the animation by JS you may like to consider doing it with CSS as that should optimise the system's use of for example the GPU as you are only changing an animatable property (opacity).
While the specific example given here could be done entirely by CSS - setting up one set of keyframes which fade in, pause and fadeout a text for 33.3333% of the total animation time of 3*whatever seconds you choose - to be more general it adds a bit of JS which is run just once at the start to set up the keyframes to give the right %s however many texts there are.
This is done by setting CSS variables which are used in CSS calcs to give the overall animation time and the delay times - each text starts its animation offset depending on its index and then it runs forever.
<head>
<style>
.desgin {
font-size: 40px;
/* color: aliceblue; */
color: #000;
align-items: center;
justify-content: space-between;
padding: 40px 150px;
position: relative;
float: left;
}
.what__design {
font-size: 8rem;
align-items: center;
float: left;
opacity: 1;
position: relative;
}
.design-kinds {
opacity: 0;
/*visibility: hidden;*/
position: absolute;
animation: fadeInOut calc(var(--num) * var(--t)) infinite linear;
animation-delay: calc(var(--n) * var(--t));
animation-fill-mode: forwards;
}
</style>
<style id="keyframes">
</style>
</head>
<body>
div class="desgin">
<div class="im__desgin">
<h1>I'm Desgin.</h1>
</div>
<div class="what__design">
<span class="design-kinds ">WebSite's</span>
<span class="design-kinds">Logos</span>
<span class="design-kinds">Brands</span>
</div>
</div>
<script>
const showFor = 6; // set this to the number of seconds each text takes to fade in, pause for 1 second and fade out again
const whatDesign = document.querySelector('.what__design');
const designKinds = document.querySelectorAll('.design-kinds');
const len = designKinds.length;
whatDesign.style.setProperty('--num', len);
whatDesign.style.setProperty('--t', showFor + 's');
for (let n = 0; n < len; n++) {
designKinds[n].style.setProperty('--n', n);
}
const pcEachGets = 100 / len; // the percentage of total cycle time each bit of text gets
const pcForOneSecond = pcEachGets / showFor; // the % of total cycle time that equals 1 second - 1 second is the required pause time
const pcFadeInOrOut = (pcEachGets - pcForOneSecond) / 2;
document.querySelector('#keyframes').innerHTML = `#keyframes fadeInOut {
0% {
opacity: 0;
}
` + pcFadeInOrOut + `% {
opacity: 1;
}
` + (pcFadeInOrOut + pcForOneSecond) + `% {
opacity: 1;
}
` + pcEachGets + `% {
opacity: 0;
}
100% {
opacity: 0;
}
}`;
</script>
</body>

I think this will help you.
if you want this animation as a infinite loop.
const changeText = document.querySelector(".what__design");
const textToShow = document.querySelectorAll(".design-kinds");
//Fade in First span and fade out Last span
let index = 0;
function showText() {
setInterval(() => {
if (index < 2) {
textToShow[index].classList.add("fadeinOut");
index++;
}
else {
textToShow[index].classList.add("fadeinOut");
setTimeout(() => {
textToShow[2].classList.remove("fadeinOut");
}, 4000);
index = 0;
}
if (index > 0) {
setTimeout(() => {
textToShow[index - 1].classList.remove("fadeinOut");
}, 4000);
}
}, 5000);
}
showText();
.desgin {
font-size: 40px;
/* color: aliceblue; */
color: #000;
align-items: center;
justify-content: space-between;
padding: 40px 150px;
position: relative;
float: left;
}
.what__design {
font-size: 8rem;
align-items: center;
float: left;
opacity: 1;
position: relative;
}
.design-kinds {
opacity: 0;
visibility: hidden;
position: absolute;
}
/* .design-kinds.active {
opacity: 1;
visibility: visible;
animation: fade 3s ease-in-out 3s 1;
} */
.design-kinds.fadeinOut {
animation: fadeInOut 4s ease-in;
visibility: visible;
}
#keyframes fadeInOut {
0%,100% {
opacity: 0;
}
20%,80% {
opacity: 100;
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div class="desgin">
<div class="im__desgin"><h1>I'm Desgin.</h1></div>
<div class="what__design">
<span class="design-kinds ">WebSite's</span>
<span class="design-kinds">Logos</span>
<span class="design-kinds">Brands</span>
</div>
</div>
<script src="index.js"></script>
</body>
</html>

I figure some out but still i have a delay that i doest succeed to manage the delay after the function is done
<div class="im__desgin"><h1>I Desgin.</h1></div>
<div class="what__design">
<span class="design-kinds" id="Kind-1">WebSite's</span>
<span class="design-kinds" id="Kind-2">Logos</span>
<span class="design-kinds" id="Kind-3">Brands</span>
</div>
</div>
.desgin {
text-align: center;
font-size: 40px;
color: aliceblue;
align-items: center;
justify-content: space-between;
padding: 40px 150px;
position: relative;
float: left;
}
.what__design {
font-size: 8rem;
align-items: center;
float: left;
position: relative;
}
.design-kinds {
text-align: center;
opacity: 0;
position: absolute;
}
.effect {
animation: animate1 4s 2s 1 ease-in-out;
transform: scale(0.5);
opacity: 0;
}
#keyframes animate1 {
0%,
100% {
transform: scale(0.5);
opacity: 0;
}
30%,
50% {
transform: scale(1);
opacity: 10;
}
30% {
transform: scale(1);
opacity: 10;
}
}
const spans = document.querySelectorAll(".design-kinds");
//call function before page load
showText();
//Changing Text
function showText() {
//Kind --1--
$("#Kind-1").addClass("effect");
setTimeout(() => {
$("#Kind-1").removeClass("effect");
}, 6000);
//Kind --2--
setTimeout(() => {
$("#Kind-2").addClass("effect");
}, 3700);
setTimeout(() => {
$("#Kind-2").removeClass("effect");
}, 9800);
//Kind --3--
setTimeout(() => {
$("#Kind-3").addClass("effect");
}, 7700);
setTimeout(() => {
$("#Kind-3").removeClass("effect");
}, 14000);
}
setInterval(showText, 13000);

How do I stop css rotate back to face before expected animation?

I'm trying to simulate the animation of flips of a coin with JS & CSS.
I guess the keys are transform-style, backface-visibility, rotateY, animation-fill-mode and transform in CSS as well as Math.random in JS.
If the coin is the heads, everything is OK.
If the coin is tail, clicking the button will flip it to head and then start the expected flipping animation.
How do I make it start flipping animation directly from the tail?
const coin = document.querySelector('#coin');
const button = document.querySelector('#flip');
const status = document.querySelector('#status');
const heads = document.querySelector('#headsCount');
const tails = document.querySelector('#tailsCount');
let headsCount = 0;
let tailsCount = 0;
function deferFn(callback, ms) {
setTimeout(callback, ms);
}
function processResult(result) {
if (result === 'heads') {
headsCount++;
heads.innerText = headsCount;
} else {
tailsCount++;
tails.innerText = tailsCount;
}
status.innerText = result.toUpperCase();
}
function flipCoin() {
coin.setAttribute('class', '');
const random = Math.random();
const result = random < 0.5 ? 'heads' : 'tails';
deferFn(function() {
coin.setAttribute('class', 'animate-' + result);
deferFn(processResult.bind(null, result), 2900);
}, 100);
}
button.addEventListener('click', flipCoin);
h2 {
margin: .25rem;
}
div.container {
margin: auto;
display: flex;
flex-direction: column;
align-items: center;
}
button {
padding: 1rem;
background-color: skyblue;
}
#coin {
position: relative;
width: 15rem;
height: 15rem;
margin: 2rem 0rem;
transform-style: preserve-3d;
}
#coin div {
width: 100%;
height: 100%;
border: 2px solid black;
border-radius: 50%;
backface-visibility: hidden;
background-size: contain;
position: absolute;
}
.heads {
background-image: url("https://en.numista.com/catalogue/photos/inde/2311-original.jpg");
}
.animate-heads {
animation: flipHeads 3s;
animation-fill-mode: forwards;
}
#keyframes flipHeads {
from {
transform: rotateY(0deg);
}
to {
transform: rotateY(1800deg);
}
}
.tails {
background-image: url("https://en.numista.com/catalogue/photos/inde/3165-original.jpg");
transform: rotateY(-180deg);
}
.animate-tails {
animation: flipTails 3s;
animation-fill-mode: forwards;
}
#keyframes flipTails {
from {
transform: rotateY(0deg);
}
to {
transform: rotateY(1620deg);
}
}
<div class='container'>
<h2>Confused about your life decision? Just flip this coin!</h2>
<h2>Btw, don't forget to assign something to both sides.</h2>
<p>And don't take your life decision based on this stupid coin flip. I was kidding.</p>
<div id="coin" class=''>
<div id="heads" class="heads"></div>
<div id="tails" class="tails"></div>
</div>
<button id="flip">Flip this thing</button>
<p>Heads: <span id="headsCount">0</span> Tails: <span id="tailsCount">0</span></p>
<p><span id="status"></span></p>
</div>

You can use the css property:
animation-fill-mode: forwards;

Updating "status()"

I'm creating a portfolio website and the way I'm navigating through projects is by using "status". So for instance, if you click/scroll once, project 1 will reveal. Click/scroll a second time, project 2 will reveal. So on so forth.
<body onwheel="switchprojects()"></body>
<div class="explore-box" onClick="switchprojects()"></div>
projectStatus = 1;
function switchprojects() {
if(projectStatus==1) {
$('#bona').removeClass('float');
$('#peak').addClass('float');
projectStatus = 2;
}
else if(projectStatus==2) {
$('#peak').removeClass('float');
$('#trap').addClass('float');
projectStatus = 3;
}
else if(projectStatus==3) {
$('#trap').removeClass('float');
$('#fp').addClass('float');
projectStatus = 4;
}
else if(projectStatus==4) {
$('#fp').removeClass('float');
$('#bona').addClass('float');
projectStatus = 1;
}
}
As you can see I have two separate elements, one for scrolling and one for clicking. It's working great so far, but I'm running into one issue—the status does not update between the two elements. If I scroll twice in the body for example, the same function on the clickable div won't update its status. Does anyone know how to fix this?
Thank you!
https://codepen.io/anon/pen/qozoKj Here's the codepen.
UPDATE: I'm not sure why, but when I uploaded my code to codepen, it seems to have updated the status of the clicks....but now every key on my keyboard activates the css change. I'm very confused.

The reason all the keys are triggering switchprojects() is because you have an onkeydown="switchprojects()" on the <body>.
The reason the clicks are not listened to is that the <div class="explore-box"> has no height or width set on it although its position: absolute. Mabey you should consider changing the click event to the <div class="section"> CodePen

Try something like
$(function(){
$('#bona').addClass('float');
});
projectStatus = 1;
function switchprojects() {
if(projectStatus==1) {
$('#bona').removeClass('float');
$('#peak').addClass('float');
projectStatus = 2;
}else if(projectStatus==2) {
$('#peak').removeClass('float');
$('#trap').addClass('float');
projectStatus = 3;
}else if(projectStatus==3) {
$('#trap').removeClass('float');
$('#fp').addClass('float');
projectStatus = 4;
}else if(projectStatus==4) {
$('#fp').removeClass('float');
$('#bona').addClass('float');
projectStatus = 1;
}
}
body {
margin: 0;
padding: 0;
overflow: hidden;
}
.section {
width: 100%;
height: 100vh;
position: relative;
}
h1 {
color: white;
font-family: 'league';
font-size: 8vw;
position: absolute;
text-align: center;
line-height: 100vh;
width: 100%;
font-weight: 100;
margin: 0;
padding: 0;
transition-timing-function: cubic-bezier(0.0, 0.3, 0.5, 1);
transition: 0s;
}
.float {
transform: translate(0)!important;
transition: transform 1s;
transition-timing-function: cubic-bezier(0.0, 0.3, 0.5, 1);
opacity: 1!important;
}
.explore-box {
position: absolute;
margin-left: 55%;
margin-top: 70vh;
}
.explore-line {
background-color: white;
width: 70px;
height: 1px;
position: relative;
float: left;
margin-top: 9pt;
margin-right: 7pt;
transition-timing-function: cubic-bezier(0.0, 0.3, 0.5, 1);
transition: 0.4s;
}
.explore-wrap {
overflow: hidden;
float: right;
}
.explore-wrap h2 {
color: white;
margin: 0;
font-size: 14pt;
transform: 1s ease;
}
<script
src="https://code.jquery.com/jquery-1.12.4.min.js"
integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ="
crossorigin="anonymous"></script>
<body style="background-color: #141219;" onwheel="switchprojects()">
<div class="section">
<h1 id="bona" style="transform: translateY(10%); opacity: 0;">BONA COFFEE</h1>
<h1 id="peak" style="transform: translateY(10%); opacity: 0;">PEAK EXPLORATIONS</h1>
<h1 id="trap" style="transform: translateY(10%); opacity: 0;">TRAP MAGAZINE</h1>
<h1 id="fp" style="transform: translateY(10%); opacity: 0;">FIELD & PANTRY</h1>
<div class="explore-box" onClick="switchprojects()">
<div class="explore-line"></div>
<div class="explore-wrap">
<h2>View</h2>
</div>
<br>
<div class="explore-wrap" style="position: absolute; right: 0;">
<h2>Project</h2>
</div>
</div>
</div>
</body>
As You say I have added the click event on View Projects instead of body

3d flip animation not working in chrome

I wanted to create a card with text which will flip and show a backside with some other text, whenever you click on the "card" (div). I checked for any mistakes and stuff but somehow its not working on chrome.
HTML:
<div class="card effect__EFFECT">
<div class="card__front">
<span class="card__text">front</span>
</div>
<div class="card__back">
<span class="card__text">back</span>
</div>
</div>
CSS:
.card {
position: relative;
float: left;
padding-bottom: 25%;
width: 25%;
text-align: center;
}
.card__front,
.card__back {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
.card__front,
.card__back {
-webkit-backface-visibility: hidden;
backface-visibility: hidden;
-webkit-transition: -webkit-transform 0.3s;
transition: transform 0.3s;
}
.card__front {
background-color: #ff5078;
}
.card__back {
background-color: #1e1e1e;
-webkit-transform: rotateY(-180deg);
transform: rotateY(-180deg);
}
.card.effect__click.flipped .card__front {
-webkit-transform: rotateY(-180deg);
transform: rotateY(-180deg);
}
.card.effect__click.flipped .card__back {
-webkit-transform: rotateY(0);
transform: rotateY(0);
}
Javascript:
(function() {
var cards = document.querySelectorAll(".card.effect__click");
for ( var i = 0, len = cards.length; i < len; i++ ) {
var card = cards[i];
clickListener( card );
}
function clickListener(card) {
card.addEventListener( "click", function() {
var c = this.classList;
c.contains("flipped") === true ? c.remove("flipped") : c.add("flipped");
});
}
})();

Here is a working fiddle http://jsfiddle.net/hzsbzxw6/ it seems that this should all work, it could be the way you're embedding the script.
<script type = "text/javascript">
Try fixing that, or ultimately not embedding it inline.